A manufacturer uses an elevator to move items from one level to another. The elevator has a mass of 800 kg and moves upward with constant acceleration for 3.50 s until it reaches its cruising speed of 1.75 m/s. (Note: 1 hp = 746 W.) (a) What is the average power (in hp) of the elevator motor during this time interval? Pave = hp (b) What is the motor power (in hp) when the elevator moves at its cruising speed? Pcruising Ihp (c) What If? If the elevator motor can only deliver constant power at one setting, the amount needed for its motion at constant speed, how long (in s) will it take the elevator to accelerate to the cruising speed of 1.75 m/s? (If you need to use co or -co, enter INFINITY or -INFINITY, respectively.) t = Need Help? Read It 10. [-/1 Points] DETAILS SERPSE10 8.A.OP.023. MY NOTES ASK YOUR TEACHER As shown in the figure below, a small mass is released from rest at point A along the horizontal diameter on the inside of a frictionless, hemispherical bowl. The mass has a mass m = 105 g and the bowl has a radius R = 32.5 cm. 2R/3 (a) Calculate the gravitational potential energy of the mass-Earth system (in ]) when the mass is at point A relative to point B. (b ) Calculate the kinetic energy of the mass (in ]) at point B. (c) Calculate its speed (in m/s) at point B. m/s (d) Calculate its kinetic energy (in ]) when the mass is at point C. (e) Calculate the potential energy (in ]) when the mass is at point C.A 5.80-kg block is set into motion up an inclined plane with an initial speed of v. = 7.40 m/s (see figure below). The block comes to rest after traveling d = 3.00 m along the plane, which is inclined at an angle of 8 = 30.0 to the horizontal. (a) For this motion, determine the change in the block's kinetic energy. (b) For this motion, determine the change in potential energy of the block-Earth system. (c) Determine the friction force exerted on the block (assumed to be constant). IN (d) What is the coefficient of kinetic friction? Need Help? Read It Master It 8. [-/1 Points] DETAILS SERPSE10 8.5.OP.017. A 675-N Marine in basic training climbs a 8.5-m vertical rope at a constant speed in 8.50 s. What is his power output? W Need Help? Read It Watch it